Motion converting mechanism



Aug. 31, 1954 Filed Sept. 12, 1950 A. SERAGNOLI 2,687,649 MOTIONCONVERTING MECHANISM 3 Sheets-Sheet 1 Fig.1

INVENTOR Arwsfo Jefiaynolz Aug. 31, 1954 A. SERAGNOLI MOTION CONVERTINGMECHANISM Filed Sept. 12, 1950 Fig.7

Fig.6

3 Sheets-Sheet 2 1954 'A. SERAGNOLI 2,687,649

MOTION CONVERTING MECHANISM Filed Sept. 12, 1950 3 Sheets-Sheet 3 7 a 9Fig.9 F1910 Fig."

INVENTOR Aria foierqynolz' ATTO N EYS Patented Aug. 31, 1954 2,687,649 iMOTIONCONVERTING MECHANISM Ariosto Seragnoli, Bologna, Italy ApplicationSeptember 12, 1950,

4 Claims.

In this mechanism the slide remains stationary only in correspondence tothe dead centres A and B, Fig. 1.

In automatic machines packaging, cartoning, conditioning, printing etc.)

it is frequently necessary that the slide remains by which the cam canbe of small dimensions as it must only supply the travel correspondingto differences of ordinates yA-yD(Fig. 1). l

The appendix which receives the cam action passes through an appropriatepassage in the disc or through the spokes of the wheel.

Serial No. 184,378

Another object of the invention consists in disposing the fulcrumcarrying the link and the extremity of the link itself (this latterbearing rest be the upper or the lower; both the above mentionedsolutions are objects of the invention.

The invention consists of the In the said drawingsthe same numbers areused to indicate the same parts through the different views and sectionsand in the different solutions preferred. Fig. 1 illustrates a diagramof the travely oi the slide according toangles 0: described by thecrank.

Fig. 2 illustrates another type of diagram that can be obtained with thepresent invention.

Fig. 3 illustrates a schematic prospective drawing of the invention in afirst preferred method of accomplishment.

Fig. 4 illustrates a longitudinal sectionof Fig. 3.

i Fig. 5 illustrates a front view of Fig. 3.

Fig. 6 illustrates a schematic prospective drawing of the invention in asecond preferred method of accomplishment.

Fig. 7 illustrates a longitudinal section of Fig. 6.

Fig. 8 illustrates a front view of Fig. 6,

Fig. 9 illustrates a longitudinal section of the invention in a thirdpreferred method of accomplishment.

Fig. 10 illustrates the shape of the convexconcave cam.

Fig. 11 illustrates the shape of the convex cam.

Fig. 12 illustrates the longitudinal section of a fourth preferredmethod of accomplishment.

Fig. 13 illustrates a projection to the right of Fig. 12.

Let us consider Figures 3, 4 and 5. The motor shaft I, operating in thebushing 2, has, at its free extremity, a rigidly aspline'd rc'rank. Onthe crank in-"4,"-is*pivoted one extremity of the oscillating link 5;the other extremity carries on one side a second crank pin 6, on theother side it carries an appendix 1 which, *througha little roller 8, isengaged in the path of cam 9 and which determines the distance from therotation axle of the second crank pin 6. This latter, through connectingrod l0, operates the slide I l which runs in the guide l2 fixed on thecasting, and moves, according to the invention, part 13 which directly=operates or indirectly controls the requiredmovements for the operationof the machine. The oscillating link 5 and the connecting rod. arelinkedone upon the other through pin 0, so as to be a'ble to rotate thembetween each other.

lFromtFig. :it is-evident that, if one desires th'atifor all=of :the-arca. the slide remain stationary, it :is necessary that in icorrespondenceto said Y are the cam be :profiledas sector having the centreonaxle-xlll of the -smallend pin and radius R-ofequalrlength to that oftheconnecting rod; characteristic whichris oneof the objects of the patent.

'In Figs.r6, '7, 8, =and 9, in prospective or in orthogonal projectionsand sections is shown a second preferred method of accomplishment Thisdiffers from the one "previously described because themotor'shaft t5operates thevariably eccentric crank throughri-a gearwheel It. Thisengages with gearwheel l.1;carri'ed on idling shaft l8. 'Solutionshowniin Fig.9, is also considered in which gearwheel TI is :zidling onthe fixed Shaft19.

Gear I! has apinZU on whichoscillating link 5 'is pivoted, connectedwith connecting rod and cam "9 throughthe-same parts previously 7described.

have at' the corresponding*pointa concave'channel as shown in Fig. 10while if the pause stage has to takeplace at the lower dead centre onewould 'always have a ?convex channel 'as shown in Fig. 11.

Figures .-12 and 13 show another preferred solution-to be-used inorder'to have always a convex cam .evenif the pause stage must i always occurat=thetop dead centre. This is obtained, as is evident/from the drawing,.byturningover the crank mechanism, so that thepausestage-is move withsufiicient approximation along a radius and one has the most simpleconditions for the correspondence of the pause.

Having'thus particularly described and ascertained the nature of my saidinvention and a few preferred manners in which it can be performed, .itis obvious and should be properly understood that the elements as havebeen described may be widely modified in their shape and mutualarrangements without departing from the scope and basic :features softhe "invention itself as defined in the following claims.

What l'claim is:

l. lna driving mechanism for wrapping ma: chines of the type specified,a driving shaityan overhung crank, with acrankpin, carried-on saiddriving shaft; a link pivoted on said-:crankpin; a stationary cam; anappendix, connected'wi-th the link, guided by said stationary -earn; "asecond crankpin, carried by the'linkyaslideg a connecting rod pivoted atone end on said second crankpin and =at-the o'ther end oi the-slide; allconstituting *a connecting rod and crank mechanism with periodicallyvariable arm, "which operates the slide by "a law dependent 'frotm theproportions of the'crank movement -and oi the cam.

2. In a driving mechanism for wrapping Imachines of the'type specified,a driving fge'ar; 5a crankpin carried on said driving gear; alinkpivoted onsaid crankpin; 'astationary ca-m; an appendix, connected withthe link,v guided by said stationary cam; asecon'd 'crankpin, carried-bythe link; a slide; a connecting rod pivoted at one end on said secondcrankpin and at the other end'on theslide; all constituting a-connectingrod and crank mechanism with periodically variable"arm,'.which operatesthe slide by a law dependent from the proportionm-ent of the gearmovement and-'of the cam.

-'3. In themechanism of claim 1, wherein the second 'cran'kpin'iscoaxially arranged with the appendix guided by the stationary cam.

4. 'In the mechanism of claim 2 wherein the second "crankpin iscoaxi'ally arranged with the appendix guided by the stationary 'cam.

References Cited in the file of this patent 'UNITED STATES PATENTSNumber Name Date 763,742 Emerson -4 June 28,11904 995,948 Bracken June20, -l9.l1l

1,970,960 Grofl Auga2l, 1934 2,463,604 Denyssen Mar. 8, 1 949

